\begin{table}

\caption{\label{tab:base_welfare_robust}Welfare impacts of nonattainment in 1997 under different model parameters or structural assumptions.}
\centering
\begin{threeparttable}
\begin{tabular}[t]{lccccc}
\toprule
Change & Total \% & Manuf. \% & Nonmanuf. \% & Attain. \% & Nonattain. \%\\
\midrule
\addlinespace[0.3em]
\multicolumn{6}{l}{\textbf{No Changes}}\\
\hspace{1em}Base Model & 0.57 & 0.18 & 0.63 & 0.36 & 0.78\\
\addlinespace[0.3em]
\multicolumn{6}{l}{\textbf{A. Parameter Changes}}\\
\hspace{1em}$\theta = 2$ & 1.22 & 0.88 & 1.26 & 0.75 & 1.68\\
\hspace{1em}$\theta = 8$ & 0.31 & -0.19 & 0.38 & 0.19 & 0.42\\
\hspace{1em}$\alpha = 0.137$ & 0.57 & 0.18 & 0.63 & 0.36 & 0.78\\
\hspace{1em}$\alpha = 0.548$ & 0.57 & 0.18 & 0.63 & 0.36 & 0.78\\
\hspace{1em}$\gamma = 0.2405$ & 0.56 & 0.09 & 0.62 & 0.39 & 0.72\\
\hspace{1em}$\gamma = 1$ & 0.57 & 0.26 & 0.62 & 0.31 & 0.84\\
\hspace{1em}$\iota = 0.495$ & 0.63 & 0.12 & 0.7 & 0.36 & 0.89\\
\hspace{1em}$\iota = 2$ & 0.4 & 0.15 & 0.43 & 0.23 & 0.56\\
\hspace{1em}$\xi$s Halved & 0.6 & 0.35 & 0.63 & 0.36 & 0.83\\
\hspace{1em}$\xi$s Doubled & 0.52 & -0.18 & 0.62 & 0.36 & 0.68\\
\hspace{1em}$\xi$s Quadrupled & 0.42 & -0.9 & 0.59 & 0.35 & 0.48\\
\addlinespace[0.3em]
\multicolumn{6}{l}{\textbf{B. Structural Changes}}\\
\hspace{1em}Add Congestion/Agglomeration & 0.62 & 0.04 & 0.71 & 0.37 & 0.87\\
\hspace{1em}VSL Increases in Income & 0.42 & 0.08 & 0.47 & 0.24 & 0.59\\
\hspace{1em}Increase Productivity 3 Percent & 0.61 & 0.43 & 0.64 & 0.36 & 0.85\\
\hspace{1em}Decrease Productivity 3 Percent & 0.53 & -0.08 & 0.62 & 0.35 & 0.71\\
\bottomrule
\end{tabular}
\begin{tablenotes}
\small
\item \textit{Note: } 
\item Welfare is computed as the equivalent variation of the observed nonattainment statuses in 1997 relative to a counterfactual where no counties are in nonattainment. Each row only makes one change relative to the base model in the first row.
\end{tablenotes}
\end{threeparttable}
\end{table}
